"""
====================================================================
Copyright (C) 2012-2013 Eric Blond

This file is part of Neptune.

Neptune is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Neptune is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Neptune.  If not, see <http://www.gnu.org/licenses/>.
====================================================================

Created on Nov 17, 2012

@author: Eric
"""

from . import page
from . import utils

#######

@utils.singleton
class CellInfo(page.Page):
    
    Class = None
    Name = None

    @page.cell
    def _Declaration(self):
        descriptor = self.Class.__dict__[self.Name]
        return descriptor._declaration

    @page.cell
    def IsStatic(self):
        return self._Declaration is None

    @page.cell
    def IsSettable(self):
        return page.CellOptionEnum.SETTABLE in self._Declaration

    @page.cell
    def IsDynamic(self):
        return not (self.IsStatic or self.IsSettable)

    @page.cell
    def IsConstructorArg(self):
        return self.IsStatic or self.IsSettable
    
    @page.cell
    def OnChange(self):
        return self._Declaration['on_change']

    @page.cell
    def Selector(self):
        return self._Declaration['selector']

#######

@utils.singleton
class PageInfo(page.Page):
    
    Class = None
    
    @page.cell
    def CellMapping(self):
        return dict((name, CellInfo(Class = self.Class, Name = name))
                    for (name, value) in self.Class.__dict__.iteritems()
                    if isinstance(value, page.NodeDescriptor))

    @page.cell
    def ConstructorArgs(self):
        return set([x.Name for x in self.CellMapping if x.IsConstructorArg])
